The optimal design of MIMO-NOMA system has been intensively studied by assuming perfect instantaneous CSI at the transmitter [1]}, [2]}. However, this assumption limits their widespread applications into resource-constrained IoT scenarios, where only the statistical knowledge of CSI is usually known to the transmitter. Nevertheless, the optimal system settings were seldom discussed in the circumstances, because the optimal design using the exact outage probability would be unmanageable. To overcome this drawback, we resort to the tractable expression of the asymptotic outage probability to ease the system optimization. To exemplify this, the goodput maximization is considered next.
